package com.atguigu.netty.heartbeat;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.timeout.IdleStateHandler;

import java.util.concurrent.TimeUnit;

public class MyServer {
    public static void main(String[] args) throws InterruptedException {
        NioEventLoopGroup bossGroup = new NioEventLoopGroup();
        NioEventLoopGroup workGroup = new NioEventLoopGroup();
        try{
            ServerBootstrap serverBootstrap=new ServerBootstrap();
            serverBootstrap.group(bossGroup,workGroup)
                    .channel(NioServerSocketChannel.class)
                    .handler(new LoggingHandler(LogLevel.INFO)) //在bossGroup中增加一个日志处理器
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            ChannelPipeline pipeline = socketChannel.pipeline();
                            //加入一个netty提供的idleStateHandler
                            /*
                            1.IdleStateHandler是netty提供的处理空闲状态的处理器
                            2.long readerIdleTime:表示多长时间没有读，就会发送一个心跳检测包检测是否连接
                            3.long writerIdleTime:表示多长时间没有写，就会发送一个心跳检测包检测是否连接
                            4.long allIdleTime:表示多长时间既没有读也没有写，就会发送一个心跳检测包检测是否连接

                            5.当IdleStateHandler触发后，就会传递给管道的下一个handler处理
                            通过调用下一个handler的userEventTriggered,在该方法中去处理IdleStateEvent(读空闲，写空闲，读写空闲)
                             */
                            pipeline.addLast(new IdleStateHandler(3,5,7, TimeUnit.SECONDS));
                            //加入一个对空闲检测进一步处理的handler(自定义)
                            pipeline.addLast(new MyServerHandler());
                        }
                    });
            ChannelFuture channelFuture = serverBootstrap.bind(7000);
            channelFuture.channel().closeFuture().sync();
        }finally {
            bossGroup.shutdownGracefully();
            workGroup.shutdownGracefully();
        }
    }
}
